Malicious PDF — malware analysis report

Static analysis result for SHA-256 1425101140359391…

MALICIOUS

PDF

101.1 KB Created: 2021-10-08 14:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a072bac8d8c0c916036485967c9d893 SHA-1: 78f1eef0a8be4b9b17e6c1e1c97e879a656f6047 SHA-256: 1425101140359391c9459a271ade4cc362314f35b096806621562ba6bad7cb1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://efuturesthai.com/uploads/file/4895665566.pdf
    • https://sgicorp.com/userfiles/files/joragiremu.pdf
    • http://banphimchuot.com/userfiles/file/mavoraravololuxipi.pdf
    • https://cargobull.cz/res/file/60320593564.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614118aa6d16b---nawugibepokevudixof.pdf
    • http://tranhdaquydep.vn/upload/files/39730260320.pdf
    • https://dukeofmarshall.com/ckfinder/userfiles/files/56087195869.pdf
    • http://mh-gartengestaltung.de/userfiles/file/70383775929.pdf
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/81176766012.pdf
    • http://madiagranitosilano.it/userfiles/files/84743359550.pdf
    • https://angkoronetour.com/userfiles/file/rejekiwejopoleroxex.pdf
    • http://driver-jazda.pl/upload/file/99943254603.pdf
    • http://c-six.it/userfiles/files/foxurixexapixedizisugol.pdf
    • https://betentour.com/sites/default/files/file/lopabaniga.pdf
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/94972876477.pdf
    • https://anaksemut.com/contents/files/rigiweguda.pdf
    • http://catwalkexotique.com/userfiles/62617249182.pdf
    • http://np-laser.com/upload_fck/file/2021-10-8/20211008041412311419.pdf
    • http://dzbnf.com/upload/file///widikotitepiveluvabupiso.pdf
    • http://phuongdonggolf.vn/app/webroot/uploads/files/pidawazowibofok.pdf
    • http://mfahk.com/upload/files/lezamixukugopet.pdf
    • http://georgewongdesign.com/gwd/upload/files/powupajuj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=tom+hardy+quotes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012728.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12728 16792 bytes
font_01_sfnt_off00013f3a.bin
d8d368d675d917fa91ac3aeb0ff1a08934fd9b47a2fcef8b7e2e573d512d4b69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3A 18440 bytes
font_02_sfnt_off00016ede.bin
27f70868eacc216a826eccea53b1ab9133952820413ed23c238b331ecd7b48a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16EDE 10592 bytes

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